AS321
Document number: DS36976 Rev. 2 - 2
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AS321
A Product Line of
Diodes Incorporated
LOW POWER SINGLE OPERATIONAL AMPLIFIER
Description
The AS321 is a high gain and internally frequency compensated
operational amplifier specifically designed to operate from a single
power supply. Operation from split power supply is also possible and
the low power supply current drain is independent of the magnitude of
the power supply voltages. Typical applications include battery
charger, active filters, general purpose controllers and most
conventional operational amplifier circuits.
The AS321 is compatible with industry standard 321.
The AS321 is available in SOT-23-5 packages.
Features
Excellent Phase Margin: 60 deg.
Large Voltage Gain: 100dB (Typical)
Low Input Bias Current: 20nA (Typical)
Low Input Offset Voltage: 2mV (Typical)
Low Supply Current: 0.35mA at VCC = 5V
Wide Power Supply Voltage:
Single Supply: 3V to 36V
Dual Supplies: ±1.5V to ±18V
Wide Input Common Mode Voltage Range: 0V to VCC-1.5V
Pin Assignments
(Top View)
(SOT-23-5/ K Package)
Applications
Battery Charger
Active Filters
General Purpose Controllers, Instruments
Typical Applications Circuit
Power Amplifier DC Summing Amplifier
INPUT + 1
2
34
5
INPUT -
VEE
VCC
OUTPUT
AS321
Document number: DS36976 Rev. 2 - 2
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AS321
A Product Line of
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Functional Block Diagram
Absolute Maximum Ratings (Note 1)
Symbol
Parameter
Rating
Unit
VS (VCC-VEE)
Power Supply Voltage
40
V
VID
Differential Input Voltage
40
V
VIN
Input Voltage
-0.3 to 40
V
θJA
Thermal Resistance to Ambient
260
C/W
TJ
Operating Junction Temperature
+150
C
TSTG
Storage Temperature Range
-65 to +150
C
TLEAD
Lead Temperature (Soldering, 10 Seconds)
+260
C
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
Parameter
Min
Max
Unit
VCC
Supply Voltage
3
36
V
TA
Ambient Operating Temperature Range
-40
+85
C
AS321
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AS321
A Product Line of
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Electrical Characteristics (Limits in standard typeface are for TA = +25oC, bold typeface applies over -40oC to +85oC (Note 2), VCC
= 5V, VEE = 0V, VO = 1.4V, unless otherwise specified.)
Notes: 2. Limits over the full temperature are guaranteed by design, but not tested in production.
3. Over the full input common-mode range 0V to VCC-1.5V (at +25oC).
4. The input common-mode voltage of either input signal voltage should not be allowed to go negatively by more than 0.3V (at +25oC). The upper end of the
common-mode voltage range is VCC-1.5V (at +25oC), but either or both inputs can go to +36V without damages, independent of the magnitude of the VCC.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIO
Input Offset Voltage
VO = 1.4V, RS = 0Ω, VCC = 5V to 30V
(Note 3)
–
2
5
mV
–
–
7
∆VIO/∆T
Average Temperature Coefficient
of Input Offset Voltage
TA = -40oC to +85oC
–
7
–
µV/ oC
IBIAS
Input Bias Current
IIN+ or IIN-, VCM = 0V
–
20
100
nA
–
–
200
IIO
Input Offset Current
IIN+ - IIN-, VCM = 0V
–
5
30
nA
–
–
100
VCM
Input Common Mode Voltage
Range (Note 4)
VCC = 30V, CMRR ≥ 50dB
0
–
VCC-1.5
V
ICC
Supply Current
RL = ∞, VCC = 5V
–
0.35
0.80
mA
–
0.45
1.0
RL = ∞, VCC = 30V
–
0.45
1.2
–
0.65
1.5
GV
Large Signal Voltage Gain
VCC = 15V, VO = 1V to 11V, RL ≥ 2kΩ
85
100
–
dB
80
–
–
CMRR
Common Mode Rejection Ratio
VCM = 0V to (VCC-1.5)V, RS ≤ 10kΩ
60
70
–
dB
60
–
–
PSRR
Power Supply Rejection Ratio
VCC = 5V to 30V, RS ≤ 10kΩ
70
100
–
dB
60
–
–
ISOURCE
Output Current
Source
VIN+ = 1V, VIN- = 0V, VCC = 15V, VO =
2V
20
40
–
mA
20
–
–
ISINK
Sink
VIN+ = 0V, VIN- = 1V, VCC = 15V, VO =
2V
10
15
–
mA
5
–
–
VIN+ = 0V, VIN- = 1V, VCC = 15V, VO =
0.2V
12
50
–
µA
ISC
Output Short Circuit Current to
Ground
VCC = 15V
–
40
60
mA
VOH
Output Voltage Swing
VCC = 30V, RL = 2kΩ
26
–
–
V
26
–
–
VCC = 30V, RL = 10kΩ
27
28
–
27
–
–
VOL
VCC = 5V, RL = 10kΩ
–
5
20
mV
–
–
30
THD
Total Harmonic Distortion
f = 1kHz, AV = 20dB, RL = 2kΩ,
VO = 2Vp-p, CL = 100pF, VCC = 30V
–
0.015
–
%
ΦM
Phase Margin
–
–
60
–
Deg
θJC
Thermal Resistance
(Junction to Case)
SOT-23-5
–
101
–
C/W
AS321
Document number: DS36976 Rev. 2 - 2
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AS321
A Product Line of
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0
4
3
3
2
1
2
1
0
12
16
20
4
24
28
32
8
36
40
Time (µs)
0
Performance Characteristics
Input Voltage Range Input Current
Supply Current Voltage Gain
Open Loop Gain vs. Frequency Voltage Follower Pulse Response
Output Voltage (V)
0 5 10 15
0
5
10
15
POSITIVE
NEGATIVE
Input Voltage (+VDC)
Power Supply Voltage (+VDC)
-25 0 25 50 75 100 125
0
2
4
6
8
10
12
14
16
18
20
Input Current (nA)
Temperature (oC)
0 5 10 15 20 25 30 35 40
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Supply Current (mA)
Supply Voltage (V)
0 8 16 24 32 40
60
75
90
105
120
Power Supply Voltage (V)
Voltage Gain (dB)
RL=2K
RL=20K
Input Voltage (V)
-20
0
20
40
60
80
0.2k 1k 10k 100k 1M 2M
Open Loop Gain (dB)
Frequency (Hz)
VCC=30V, VEE=0V
RL=2k, CL=100pF
AS321
Document number: DS36976 Rev. 2 - 2
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AS321
A Product Line of
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100
200
300
400
500
600
700
800
Time (µs)
0
4
8
12
16
20
Performance Characteristics (Cont.)
Voltage Follower Pulse Response (Small Signal) Large Signal Frequency Response
Output Characteristics: Current Sourcing Output Characteristics: Current Sinking
Current Limiting
1k 10k 100k 1M
0
5
10
15
20
Frequency (Hz)
Output Swing (V)
0.1 1 10 100
0
1
2
3
4
5
6
7
8
Output Voltage Referenced to Vcc (V)
Output Source Current (mA)
1E-3 0.01 0.1 1 10 100
0.01
0.1
1
10
VCC=15V
Output Voltage (V)
Output Sink Current (mA)
VCC=5V
-25 0 25 50 75 100 125
0
10
20
30
40
50
60
70
80
90
100
Output Current (mA)
Temperature (oC)
Output Voltage (mV)
AS321
Document number: DS36976 Rev. 2 - 2
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© Diodes Incorporated
AS321
A Product Line of
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Ordering Information
AS321 X XX - XX
PackingPackageProduct Name E1/G1
TR : Tape & Reel
K : SOT-23-5 G1 : Green
E1 : Lead Free
Diodes IC's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Products with "G1" suffix are available in green packages.
Package
Temperature
Range
Part Number
Marking ID
Packing Type
Lead Free
Green
Lead Free
Green
SOT-23-5
-40°C to +85°C
AS321KTR-E1
AS321KTR-G1
E6T
G6T
Tape & Reel
AS321
Document number: DS36976 Rev. 2 - 2
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AS321
A Product Line of
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Package Outline Dimensions (All dimensions in mm(inch).)
(1) Package Type: SOT-23-5
2.820(0.111)
2.650(0.104)
1.500(0.059)
0.000(0.000)
0.300(0.012)
0.950(0.037)
0.900(0.035)
0.100(0.004)
0.200(0.008)
0.300(0.012)
8°
0°
3.100(0.122)
1.700(0.067)
3.000(0.118)
0.500(0.020)
0.150(0.006)
1.300(0.051)
0.200(0.008)
0.600(0.024)
1.800(0.071)
2.000(0.079)
0.700(0.028)
REF
TYP
1.450(0.057)
MAX
AS321
Document number: DS36976 Rev. 2 - 2
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AS321
A Product Line of
Diodes Incorporated
Suggested Pad Layout
(1) Package Type: SOT-23-5
E2
E1
Y
X
GZ
Dimensions
Z
(mm)/(inch)
G
(mm)/(inch)
X
(mm)/(inch)
Y
(mm)/(inch)
E1
(mm)/(inch)
E2
(mm)/(inch)
Value
3.600/0.142
1.600/0.063
0.700/0.028
1.000/0.039
0.950/0.037
1.900/0.075
AS321
Document number: DS36976 Rev. 2 - 2
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© Diodes Incorporated
AS321
A Product Line of
Diodes Incorporated
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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final and determinative format released by Diodes Incorporated.
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